Adsorption of Organophosphates into Microporous and Mesoporous NaX Zeolites and Subsequent Chemistry

Due to the neurotoxicity of organophosphate (OP) pesticides and nerve agents synthesized as military or terror agents, their safe destruction and disposal is of considerable current importance. A representative OP, trimethyl phosphate (TMP), was adsorbed onto NaX zeolite, two mesoporous modification...

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Bibliographic Details
Published in:Environmental science & technology 2011-04, Vol.45 (7), p.3000-3005
Main Authors: Meng, Qingguo, Doetschman, David C, Rizos, Apostolos K, Lee, Min-Hong, Schulte, Jürgen T, Spyros, Apostolos, Kanyi, Charles W
Format: Article
Language:English
Subjects:
Adsorption
Applied sciences
Chemical reactions
Diffusion
Environmental Restoration and Remediation - methods
Exact sciences and technology
Global environmental pollution
Magnetic Resonance Spectroscopy
Neurotoxicity
NMR
Nuclear magnetic resonance
Organophosphates - chemistry
Pesticides
Pollution
Porosity
Remediation and Control Technologies
Silica
Solvent extraction processes
Water - chemistry
Zeolites
Zeolites - chemistry
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Summary:Due to the neurotoxicity of organophosphate (OP) pesticides and nerve agents synthesized as military or terror agents, their safe destruction and disposal is of considerable current importance. A representative OP, trimethyl phosphate (TMP), was adsorbed onto NaX zeolite, two mesoporous modifications, and a low-silica X zeolite. The nucleophilic chemical reactions of TMP with the zeolites were investigated by solid-state 13C and 31P nuclear magnetic resonance (NMR) and the solvent extracts by 1H, 13C, and 31P NMR. Nucleophilic substitution and subsequent hydrolysis reaction schemes are proposed. All of the zeolites have similar TMP decomposition yields, supporting the hypothesis that slow or incomplete diffusion of TMP in the microporous zeolite regions limits TMP decomposition.
ISSN:0013-936X
1520-5851
DOI:10.1021/es1030678